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Pierre Janssen was a French astronomer who in 1868 discovered the chemical element helium and how to observe solar prominences without an eclipse. His work was independent of that of the Englishman Sir Joseph Norman Lockyer, who made the same discoveries at about the same time.
- The Editors of Encyclopaedia Britannica
Pierre Jules César Janssen (22 February 1824 – 23 December 1907), usually known as Jules Janssen, was a French astronomer who, along with English scientist Joseph Norman Lockyer, is credited with discovering the gaseous nature of the solar chromosphere, but there is no justification for the conclusion that he deserves credit for the co ...
French astrophysicist Pierre Jules Janssen traveled across the world in an attempt to understand the cosmos, and was the first to sight the wavelength pattern of helium in his spectroscope.
Aug 18, 2022 · When watching the total eclipse on August 18, 1868 in Madras, British India, French astronomer Pierre Janssen discovered the new chemical element Helium. Janssen also is credited with discovering the gaseous nature of the solar chromosphere.
Pierre-Jules-César Janssen, a French astronomer first observed the yellow line spectrum during the solar eclipse in 1868. Sir Norman Lockyer, an English astronomer, realized that no known element at that time could be responsible for the line of wavelength 587.49 nm and hence named the unknown element as helium.
- 4.0026 amu
- gas at 298 K
- Helium
- He
Aug 18, 2009 · French astronomer Pierre Jules César Janssen camped out in Guntoor, India, to watch as the moon passed in front of the sun and revealed the solar prominences. Like other sun-gazers that morning,...
Dec 31, 2009 · The discovery of helium's existence preceded its discovery as an element on Earth. In 1868 Pierre J. C. Janssen travelled to India to study a total eclipse and he observed a new line in the corona spectrum, which meant an unknown element was present on the sun.
